The Caleffi 551041A is a DISCAL air separator with a 1-1/2 in sweat connection and a brass body, engineered to continuously remove entrained air from closed-loop hydronic heating and cooling systems down to the micro-bubble level.
Product data compiled from Caleffi North America technical documentation. Last reviewed June 2026.
Key Features
100% Air Removal
Continuously removes entrained air down to the micro-bubble level, restoring thermal output and quiet operation.
Low Head Loss Element
An internal coalescing element merges micro-bubbles with minimal pressure drop.
Bidirectional Flow
Flow is permitted in either direction, simplifying installation on horizontal piping.
Drain Blowdown
An integral drain valve clears separated air and debris without taking the system offline.
1-1/2 In Sweat Connection
1-1/2 in sweat connection sized for the application.
Brass Construction
Brass body with stainless and EPDM internal components for hydronic service.
Technical Data
| Function | Air separation |
|---|---|
| Series | Caleffi DISCAL |
| Connection | 1-1/2 in sweat |
| Body material | Brass |
| Maximum operating pressure | 150 psi |
| Medium temperature range | 32 - 250 °F |
| Suitable fluids | Water, glycol solution (max 50% glycol) |
| Air separation efficiency | 100% to micro-bubble level |
Documentation
Technical brochureRelated Products
Frequently Asked Questions
It is an air separator that continuously removes air entrained in a closed hydronic loop down to the micro-bubble level, reducing noise, corrosion and circulation problems.
No. This model separates air only. For combined air, dirt and ferrous-particle removal, use a DISCALDIRTMAG model.
150 psi maximum operating pressure with a medium temperature range of 32 - 250 °F.
- Type:
- Air Separator
- Series:
- DISCAL
- Body Material:
- Brass
- Connection Type:
- Sweat
- Connection Size:
- 1-1/2 in
